Or, of course, you can wait to be looking at all the cats and have one reach out and put his paw on your hand, which is what Amon did to me at the rescue event where I met him.
Amarna climbed on top of me in the cat room at the shelter. So had other cats, but she immediately curled up in my arms and started cleaning herself, which struck me as making herself at home as opposed to taking advantage of a sucker who'll pet any cat who comes by. Then she wouldn't let me leave, so I made it a point to memorize her collar number and ask for her details at the front desk.
Looking back, it was a definitely "click" with us. I hadn't thought about getting a black cat, but I did want a female around 2 or 3 years old, and she fit that perfectly. It wasn't until I got her home that I found out how talkative she is, which I highly enjoy (except for when it's 3:00 am).